CN2095978U

CN2095978U - Automatic pressure head limited valve

Info

Publication number: CN2095978U
Application number: CN 91216384
Authority: CN
Inventors: 龚锦; 肖青
Original assignee: Individual
Current assignee: Individual
Priority date: 1991-06-22
Filing date: 1991-06-22
Publication date: 1992-02-12

Abstract

The utility model relates to a self-operated available press head limited valve. The cylinder body of a driver is provided with an upper and a lower cavity pressure guide pipes. The cylinder body is provided with a piston. A valve body is a bivalve structure. The upper end of the valve body is connected with the lower end cover of the driver. The lower end cover of the valve body is provided with an adjusting screw, a screw nut, a spring and a press piece. A valve rod is connected with the piston together with the valve body. The utility model has automatic balancing ability, is automatically adjusted, causes the hot net to always operate in optimum condition, saves the energy, and simplifies the operation.

Description

Automatic pressure head limited valve

The utility model relates to the available pressure head limiting valve of a kind of self-powering type, belongs to valve class mechanical component technical field.

At present in the heating station system, the hydraulic misadjustment of outside ductwork is the great reason that makes heating system (being the heating power imbalance) uneven in temperature and waste energy in a large number, development along with housing estate development, this problem also has been subjected to attention, developed multiple regulation technology and modulating valve thereupon, utilized microcomputer optimized design, the runnability of analog system, use various intelligent instruments and modulating valve, system is moved under optimum, and modulating valve is exactly its critical component, in the past the gate valve of Shi Yonging, stop valve does not all have linear regulating function, can not be applicable to modulating valve, thereby, use manual modulation valve to combine in recent years again with microcomputer, achieve noticeable achievement, do not reach self-regulating effect yet, can only once regulate, the long-term use, just can not move under the best circumstances in case the heat supply network situation changes, therefore demand further improving the structure of valve urgently.

The purpose of this utility model is to provide a kind of self-powering type available pressure head limiting valve, and it can overcome above-mentioned deficiency, by the restriction to the available pressure head of user, realizes flow control, make heat supply network at optimum in operation.

The purpose of this utility model is achieved in that the ability that at first makes valve have self balancing, and its motive force is from the immense pressure of pipe network, rather than external power.In engineering design, each user's water yield is got by calculation of Heat Load, differs bigger, but the required pressure head of each user calculates according to the pipe network equilibrium principle, is more or less the same, and generally grasps at " tall building △ P≤2000mmH ₂O, tall building △ P≤1500mmH ₂O, it is just passable that the pressure △ P ' that outer net is supplied with can satisfy required pressure head, and this is called available pressure head restriction.Common △ P=SG ₂, S is the system-head curve coefficient, the S value is a constant after pipeline is determined, so restriction △ P ' has also just limited flow G, this limiting valve just utilizes this principle.The structure of limiting valve is divided into two parts, valve body and spool driving part, valve body is that the bivalve stand structure is so that the spool stress balance, driver is similar to the mechanism of a cylinder piston, power is from the pressure difference △ P ' on the heating power user turnover water pipe, the spool that is connected with valve rod is housed in the valve body, in the lower end inner chamber of valve body the pressure head setting spring is housed, spring pressuring plate is contained between the spring valve stem end, the valve rod lower end is connected with adjusting screw, and adjusting nut is contained in the end cap inner chamber, turns screw and can align the spring tightness, can align available pressure head, in the valve body lower end lid, spring chamber is housed also and mend core.

The structural drawing of the available pressure head limiting valve of Fig. 1 self-powering type.

Now in conjunction with the accompanying drawings the structure of limiting valve is described in further detail in down: among Fig. 1, there is garden annular stopper (15) lower end surface of driver end cap (1), can closely be connected with screw thread with the inner chamber external screw thread of driver cylinder body (2), the lower left quarter of cylinder body (2) has driver cavity of resorption catheter pressure (4), and there is external screw thread its outside; The upper right quarter of cylinder body (2) has driver upper cavity pressure conduit (5), and also there is external screw thread the outside of conduit (5); Actuator piston (3) is a cross, its lower end is stretched from the center line of cylinder body (2) bottom, one garden shape projection (16) is arranged at cylinder body (2) bottom, it has female thread, and valve body upper end cap (6) is a stepped shape, there is external screw thread its upper end, just in time be screwed in the projection (16) of cylinder body (2), valve body (7) is the structure of bivalve seat, the seam of upper end cap (6) bottom just in time matches with the top inner chamber of valve body (7), be connected with the spool (8) of valve rod, its upper end is connected with actuator piston (3) end, and pass the center hole of upper end cap (6), valve body lower end lid (10) is a stepped shape, the inner chamber that its top seam just is being easy to act as valve body (7) bottom cooperates, valve rod stretches in the hole of lower end cap (10), in lower end cap (10) lower lumen pressure head setting spring (11) is housed, between spring (11) upper end and the valve stem end spring sheet (14) is housed, and the lower end is connected with adjusting screw (13), adjusting nut (12) is housed in the hole of (valve body) lower end cap (10), turn the tightness that screw (13) can Regulation spring (11), in the central upper portion hole of valve body lower end lid (10) female thread is arranged, and spring chamber benefit core (9) hole is screwed in the lower end cap (10) with external screw thread, and valve rod hole passes this and mends core (9).

The driving force that driver gives valve rod equals to act on the product of the pressure difference and the piston surface area of actuator piston both sides, make the spool balance, a reaction force must be arranged, the pressure head setting spring of valve body bottom plays this effect, and can adjust according to required pressure head size, because the distortion of spring is directly proportional with stressed, and in the displacement of spool total travel, the suffered power of valve rod is different, therefore, △ P is not a definite value, but a pressure reduction band (territory), during the valve standard-sized sheet, spring stress F=0.15kg/cm ²* 50cm ²=25kg, F=0.20kg/cm when valve cuts out ²* 50cm ²=10kg is the spring constant that parameter just can be determined spring with these data and spool total travel.

When the water pump termination of pumping, valve is in full-gear, and behind the pump startup, valve begins action, is example with the tall building, and △ P ' surpasses 1500mmH ₂During O, valve begins to turn down, and resistance increases, and when the spool drag was identical with △ P ', spool was just no longer mobile, and user's actual ram is just between 1500-2000mmH ₂Between the O, flow can not exceed permission range.

Compared with prior art, the utlity model has following advantages:

1, can realize automatically regulating through remedying microcomputer in conjunction with the deficiency of manual modulation valve, the variation that can adapt to the heat supply network operating mode is regulated, but moves row all the time in the working condition of the best.

2, save the energy

3, simple in structure, use reliable.

Claims

1, the available pressure head limiting valve of a kind of self-powering type, it is characterized in that it is made up of driver and valve body, driver end cap (1) lower end surface has seam in the annular of garden (15) to match with cylinder body (2), cylinder body (2) lower left quarter has driver cavity of resorption catheter pressure (14), cylinder body (2) upper right quarter has upper cavity pressure conduit (5), actuator piston (3) is a cross, its lower end is by stretching out in cylinder body (2) the lower central hole, projection (16) is arranged at cylinder body (2) bottom, and it has female thread, valve body upper end cap (6) is a stepped shape, the upper end has external screw thread can be screwed in the projection (16), valve body (7) is the bivalve stand structure, upper end cap (6) bottom seam matches with the top inner chamber of valve body (7), be connected with the spool (8) of valve rod, its upper end is connected with piston (3) is terminal, pass upper end cap (6) center hole, valve body lower end lid (10) is a stepped shape, valve rod stretches in the hole of lower end cap (10), in lower end cap (10) lower lumen pressure head setting spring (11) is housed, between upper end and valve stem end spring sheet (14) is housed, the lower end is connected with adjusting screw (13), and adjusting nut (10) is contained in the hole of lower end cap (10), and spring chamber is mended core (9) and is contained in the lower end cap (10).